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Ants: routing and our own terms (from Nov 2026)

Exact geometry check

Testing a candidate track against the real pad and track shapes with exact nanometre math before accepting it.

How it looks

Drawing: an idealised close-up
ZOOMED IN TO 1 MMpad of another net0.20 mm clearancecandidate trackmeasured gap: 0.187 mm, rejected
A track the grid thought was fine, measured against the real rounded pad shape: it comes 0.013 mm too close.

How it works

ZOOMED IN TO 1 MMpad of another net0.20 mm clearancethe lattice says: path is clear (it only looked at grid points)exact check: real gap 0.187 mm, below 0.20. Rejected.nudged out: real gap 0.212 mm. Accepted.

Where it fits

The exact check is the "legality" half of the hybrid router. KiCad's DRC does the same measurement afterwards as the referee.

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